My I ph 5 once I start downloading anything it stops by itself in the middle or after some time ..

Hi Ravi4477,

I apologize, I'm a bit unclear on the exact nature or context of your question. If you are talking about downloads from the iTunes Store, you may find the troubleshooting steps outlined in the following articles helpful:

iTunes: How to resume interrupted iTunes Store downloads - Apple Support

iTunes Store: How to delete a downloading purchase on iOS - Apple Support

Regards,

- Brenden